Improvement in hydraulic pumps for testing-machines



, T..OLSEN.

`I-IydraulijoPump forTesting-IVIamhiners.V

No. 216,752. Patented June 24, 1879'.

Wilness'es. n l Inventor. Y

KPEERS, PHOTUJJTHOGRAPME WASMINGION. ILC.

UNITED STATES PATENT OEETcE.

TINIUS OLSEN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN HYDRAULIC PUMPS FOR TESTING-MACHINES.

Specication forming part of Letters Patent No. 216,752, dated June 24,187.9 application filed` January 10, 1879.

To all whom lt may concern.:

Be it known that I, TINIUS OLsEN, of Philadelphia, county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulImprovement in Hydraulic Pumps for Testing-Machines, of which thefollowing is a specification l The invention relates to hydraulicpumpsfor testing-machines and for other purposes.

Heretofore such pumps have not been provided with adjustable stroke whenthree or more plungers are necessary, for the sake of an even flow offluid to the jack, and the adjustable feature is necessary for makingdifferent classes of tests. Also, heretofore, for working the ram inboth directions, two pumps or other more or less cumbersome applianceshave been employed. u

The object of my invention is to so arrange the device for working theplun gers, when th ree or more are used, that the stroke of same may beadjusted while they are running; and the object also is to run the ramor the piston of jack in both directions with one pump.

The invention consists in the adjustable central fulcrum of leversinterposed between the eccentrics and the connecting-rods of theplungers of the pump 5 and it also consists in the arrangement ofchange-valves for reversing the flow of iiuid to either end of ahydraulic jack or cylinder, and so' change the movement of plunger orpiston for same.-

In accompanying drawings, in which similar letters of reference indicatelike parts, AFigure I is a side view in section; Fig. II, an end view ofthe pump and the arrangement for its working; Fig. III, end view, andFig. IIII a section through the change-valves.

On top of reservoir A is secured the pump B, as well as the standards (lfor the driving arrangement.

The motion of the three plungers D is transmitted from driving-pulley Ethrough shaft F, eccentrics G, yokes or levers H, and connecting-rods I,all of which are supported on the standards CL y The yokes H arepivotedon the shaft K. Shaft K is so arranged that it can be moved fromone end to the other of the yokes H by means of the sliding frame L, inwhich it is secured. Frame L is guided in the standards G, and can bemoved back and forth by the screw M and hand-wheel N.` By this means thestroke ofthe plungers can be made longer or shorter at will withoutstopping the pump when in operation.

a a a are the suction-pipes of the pumps; b, the suction-valves, and cand d checlcvalves, between which is the relief-valve c, which, whenopen, prevents any iow of iluid to the jack, and is under control of theoperator through the leverf, shaft g, and handle t.

The change-valves lc, l, on, and n, Figs. III and IIII, serve thepurpose of directingthe flow of the fluid to either end of the cylinderor jack. llhe opening of the valves is performed by the cross-bars c andp, the ends of which each fit on the ends of two alternate valves, asshown in Fig. III, ends of bar o fitting onto ends of valves k and n,and ends of bar p iittin g on the ends of valves m and l.

Through the bars o and p, as well ns longitudinally and centrallybetween the four valves, passes the rodi'. To this rod r are secured thebars o and p, a certain distance apart, so that when the bar r, by thelever S,'Figs. II and III, is pushed in, the valves 7c and u are openand the valves l and m shut. A contrary motion will open the valves land m, the valves k and n being left free to shut, the closing lnotionof the valves being performed by the pressure of the iluid and a smallspring, fw, on the head of the valves. f

The connection between one end of the jack and the iirst pair of valvesshown in Fig. IIII will be as follows: Pipe Tis the conduit to thereservoir, and pipe T to the end of the jack. V is the conduit from thepump. As the valves are represented in Fig. IIII, no fluid is admittedto that end of the jack to which these valves belong. The fluid,however, can freely return through pipe T', valve k, 'and pipe T to thereservoir. By reversing the valves it will be seen that the valve lawill shut, stopping the return iiow to the jack, and valve lopen, andthe iluid from the pump passing through the same. The second pair ofvalves, m and n, with 'pipes It and R', are placed in the conduit fromthe pump to the other end of the jack, and are operated similar to thefirst, lc

vand l, only their relative position to the jack tion with plungers D,for the purpose herein is reversed-that is to say, if the first vpairare specified. y i

placed for iow from the pump to the jack, the 2. Theveombination of thechange-Valves 7c, second are placed for 110W from the jack to the l, m,and n, cross-bars o and p, and rod r, for

reservoir, and vice versa. the purpose herein set forth.

What I claim as new, and desire to secure TIN IUS OLSEN. by LettersPatent, is- Witnesses:

1. The shaft F, eeeentries G, yokes H, shaft I. N. DE HAVEN, K, slidingframe L, and screw M, in eombina- GRAS. ROBSON.

